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As the title suggests, I would like to repurpose an old ebike battery (36v) to be a supplementary car starter, which is a 12v system, but I would like the voltage at the car battery terminals to be 14v. Is this doable? I would also like to have the battery as a backup ebike battery, so prefer...

I have 2 Kalkhoff 17Ah batteries, one is significantly more worn than the other, but the worn one is the original coloured casing with its graphics etc, while the better one is a plain black. So as you've probably guessed, I propose to open both up and swap the cells and all the gubbins so I...

A friend is interested in buying a Stealth ebike such as this one: http://stealthbikeuk.co.uk/ According to the description, some of these bikes have a 1000w motor but can be switched between a resticted 'road legal' mode and an unrestricted off-road mode. I was wondering whether a dual mode...

I want to change the wheel size in the impulse system in order to get a couple of extra mph assist - just to 20mph or so (where I run out of gears). If the actual wheel size is 28", what should I dupe the system into believing the wheel size is? I thought it should be a smaller size but have...

This is on a Kalkhoff Agattu impulse 1 bike. The noise is a regular ticking/clicking/clinking, around once per revolution, coming from the motor area. It is present when motor is on or off. It is also present when there is no load and the bike is inverted. It's not the chain catching on...

I have 2 batteries; they are both the same capacity (Kalkhoff 17Ah). I have only properly used the spare once, when on a cycling holiday in France where daily charging was not possible. Would it be better to use them alternately or put one in cool storage and use it occasionally and when the...

Along the flat it's very smooth but when going up hill, particularly a steep hill, there is a definite rough 'grainy' feel from the cranks. It is not accompanied by a horrible noise - just the normal noise but louder and more noticeable since the motor is working harder. I'm not sure when it...

I have a clacking sound from the crank/chain area but might be from the rear hub. It sounds exactly like that described on a thread here, which I was reading a while ago, which turned out to be the motor mounting bolts..there was talk of loosening the bolts then jiggling and retightening..but I...

Hello experts! I have a Kalkhoff agattu 2013 model and the battery was recently replaced under warranty. Under the instructions for impulse 1 bikes (the one I have), the battery should have a 'learning cycle' where it is run down to empty for the first cycle. However under the instructions...